JPS6062687A - Cooling device for compressor - Google Patents

Abstract

PURPOSE:To cool the motor section reliably by arranging a piping having one end opened in an oil feed pump and the other end opened to the vicinity of motor section in an enclosed case while providing an oil groove in the vicinity of motor section in the enclosed case. CONSTITUTION:A piping 12 having one end opened in the oil feed pump 9 and the other end opened in the vicinity of motor section in an enclosed case 1 is arranged at the outside of said case 1, while an oil groove 13 is provided in the vicinity of motor section in said case 1. Since lubricant cooled at the outside of said case 1 will flow around the motor section to cool it, it can be cooled reliably even for high compression ratio. While since deterioration of lubricant is prevented, high oil temperature can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooling device for a hermetic compressor or a semi-hermetic compressor used in a heat pump water heater or the like.

Conventional configuration and its problems Figure 1 shows a conventional hermetic compressor (hereinafter simply referred to as a compressor).
In this figure, a is a sealed case of a compressor, and inside this sealed case B is a motor section consisting of a stator b and a rotor C, and a first frame d and a second frame. A compressor section consisting of a 7 cylinder f forming a cylindrical compression chamber between the cylinder f and a piston g that rotates in contact with the inner periphery of the cylinder f is assembled and sized appropriately.
・Can be driven from the electric motor section via h. rotating shaft h
An oil passage (not shown) is formed inside the lubricating knob, and the lubricating oil stored at the bottom of the sealed case a is sucked up by the rotation of the rotating shaft h, and is forced into the oil passage, and is then pumped into the lubricating part. It is lubricated by a pouring oil (not shown). The refrigerant gas enters the cylinder f from the suction pipe 3 and enters the cylinder r.
The liquid is compressed inside, is completely discharged into the space inside the closed case a through a discharge valve (not shown), and circulates through a well-known refrigeration cycle through a discharge pipe k.

In this compressor, the electric motor generates heat due to motor loss, so it is cooled by refrigerant gas discharged from the compressor. In order to obtain a high water temperature with heat pump hot water supply, the compression ratio must be increased, but this increases the temperature of the refrigerant gas discharged from the compressor section, which cools the electric motor section sufficiently. Conventional compressors have the disadvantage of not being able to achieve high compression ratios, and therefore being unable to obtain high water temperatures, as the lubricating oil deteriorates considerably.

Purpose of the Invention The present invention solves the drawbacks of the conventional compressors mentioned above.The present invention has a simple structure, reliably cools the electric motor even when the compression ratio of the compressor is high, and prevents lubricating oil from deteriorating. prevent,
The purpose is to obtain high water temperature with heat pump hot water supply.

Composition of the Invention The compressor cooling device of the present invention has an electric (shallow section) consisting of a rotor and a stator, and a compressor section driven by this electric motor section via a rotating shaft, in a closed or semi-closed case. A lubricating oil pump is provided at one end of the rotary shaft, and a portion of the lubricating oil is guided out of the hermetically sealed or semi-semi-sealed case from the oil pump. Piping is provided from the electric motor back into the sealed or semi-sealed case, and an oil groove is provided near the motor portion of the sealed or semi-sealed case.

DESCRIPTION OF EMBODIMENTS The present invention will now be described with reference to FIG. 2 of the accompanying drawings, which shows one embodiment thereof.

In the figure, reference numeral 1 denotes a sealed case of the compressor. Inside the sealed case 1, there is a motor section consisting of a stator 2 and a rotor 3, and a cylindrical compressor between a first frame 4 and a second frame 5. A compressor section consisting of a piston nore or the like that rotates in contact with the inner periphery of the cylinder 6j forming the chamber and the cylinder 6 is disposed and assembled to an appropriate size. It can be driven by the electric motor. An oil passage (not shown) is formed in the rotary shaft 8, and the rotation of the rotary shaft 8 is used to suck up the lubricating oil stored at the bottom of the sealed case 1 with the oil supply pump 9 and pump it through the inside of the oil passage. , is lubricated by an oil tank (not shown) drilled in the oil slip. The refrigerant gas enters the cylinder 6 through the suction pipe 1Q, is compressed within the cylinder 6, and then passes through a discharge valve (not shown) to the sealed case 1.
The liquid is discharged into the internal space and circulated through a well-known refrigeration cycle from the discharge pipe 11.

One end of the pipe 12 opens into the fuel supply pot 9, the other end opens near the electric motor section inside the sealed case 1, and the middle part thereof is disposed outside the sealed case 71. An oil groove 13 is still provided near the electric motor section inside the sealed case 1.

In this cooling device, a part of the lubricating oil sucked up by the oil supply pump 9 is guided to the outside of the sealed case 1 through a pipe 12, and is cooled in a heat exchange section 14 by means such as water cooling or air cooling. The oil returns to the inside, passes through an oil groove near the electric motor section, and is stored at the bottom of the sealed case 1.

In this way, the lubricating oil cooled outside the sealed case 1 flows around the motor to cool the motor, so even if the compression ratio of the compressor is increased, the motor can be reliably cooled and the lubricating oil can be prevented from deteriorating. This prevents the water from oxidizing, making it possible to obtain a high water temperature. Note that although the above description is about a hermetic compressor, similar effects can be obtained with a semi-hermetic compressor.

Effects of the Invention As is clear from the above embodiments, the compressor cooling device of the present invention includes an electric motor section consisting of a rotor and a stator, and a motor section driven by the motor section via a rotating shaft, in a closed or semi-closed case. A lubricating oil pump is provided at one end of the rotary shaft to utilize the rotation of the rotary shaft, and a portion of the lubricating oil is once guided out of the sealed or semi-sealed case from this oil pump. By arranging piping that returns from the motor section to the sealed or semi-sealed case, and providing an oil groove near the motor section of the sealed case, the structure is simple and reliable even when the compression ratio of the compressor is increased. It has various advantages such as cooling the electric motor, preventing deterioration of lubricating oil, and providing a high hot water temperature when used in a heat pot water heater.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional hermetic compressor, and FIG. 2 is a longitudinal sectional view of a hermetic compressor equipped with a cooling device according to an embodiment of the present invention. 1... sealed case, 2- stator, 3...
・Rotor, 837. ... Rotating shaft, 9 ... Oil supply pump, 11 ... Discharge pipe, 12 ... Piping, 13 ... Oil groove, 14 ... Heat exchange section.

Claims (1)

[Claims] A motor section consisting of a rotor and a stator and a compressor section driven by the motor section via a rotating shaft are disposed in a sealed or semi-sealed case, and one end of the rotating shaft utilizes the rotation of the rotating shaft. equipped with a refueling pump,
From this oil supply pump, a piping is provided that leads some of the lubricating oil out of the sealed case and returns it from the electric motor section to the inside of the sealed or semi-sealed case. Compressor cooling device with oil grooves.